 /*******************************************************************************
  * Copyright (c) 2000, 2006 IBM Corporation and others.
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
  * which accompanies this distribution, and is available at
  * http://www.eclipse.org/legal/epl-v10.html
  *
  * Contributors:
  * IBM Corporation - initial API and implementation
  *******************************************************************************/
 package org.eclipse.ui.internal;

 import com.ibm.icu.text.Collator;
 import java.util.Comparator ;

 import org.eclipse.ui.IWorkingSet;

 /**
  * Compares two working sets by name.
  */
 public class WorkingSetComparator implements Comparator {
     
     /**
      * Static instance of this class.
      * @since 3.2
      */
     public static WorkingSetComparator INSTANCE = new WorkingSetComparator();
     
     private Collator fCollator = Collator.getInstance();

     /**
      * Implements Comparator.
      *
      * @see Comparator#compare(Object, Object)
      */
     public int compare(Object o1, Object o2) {
         String name1 = null;
         String name2 = null;

         if (o1 instanceof IWorkingSet) {
             name1 = ((IWorkingSet) o1).getLabel();
         }

         if (o2 instanceof IWorkingSet) {
             name2 = ((IWorkingSet) o2).getLabel();
         }

         int result = fCollator.compare(name1, name2);
         if (result == 0) { // okay, same name - now try the unique id

             if (o1 instanceof IWorkingSet) {
                 name1 = ((IWorkingSet) o1).getName();
             }

             if (o2 instanceof IWorkingSet) {
                 name2 = ((IWorkingSet) o2).getName();
             }
             
             result = fCollator.compare(name1, name2);
         }
         return result;
     }
 }

